Senior Security Engineer DeFi & AI Security

Ant-Tech is a fast-growing fintech and blockchain technology company building secure financial infrastructure for the next generation of on-chain finance. The Senior Security Engineer will partner with the Head of Security to build, operate, and scale the security program, owning initiatives across product, infrastructure, and operations. The role focuses on threat modeling, security operations, incident response, tooling, automation, and AI-enabled security workflows in highly adversarial environments.

Responsibilities:

• Threat model new product features and integrations and strengthen systems with effective security controls
• Operate and improve the application security toolchain while keeping it high-signal for engineering teams
• Own day-to-day security operations across EDR, SIEM, on-chain monitoring, identity, and cloud security
• Triage security alerts, investigate incidents, resolve vulnerabilities, and continuously reduce security noise
• Assess vulnerability and bug-bounty findings based on actual exposure and drive remediation through completion
• Support incident response activities from initial investigation through resolution
• Lead security tooling and projects from evaluation and vendor selection through company-wide implementation
• Collaborate closely with engineering, infrastructure, product, and other teams
• Automate repetitive security workflows using AI, including vulnerability management, AppSec, access reviews, SOC 2 and audit evidence collection, vendor due diligence, and recurring security reporting
• Build reusable AI components, Claude skills, and security agents that can be adopted by engineering and other teams

Requirements:

• 5+ years of hands-on security engineering experience across product/application security and security operations
• Strong track record conducting technical security assessments of software and systems
• Experience with system hardening, security policy analysis, and implementing effective security controls
• An adversarial mindset with the ability to think like an attacker and challenge assumptions
• Proficiency in Python, TypeScript, or JavaScript
• Experience working with Claude Code, Codex, or similar AI development tools
• Hands-on experience applying AI/LLMs to security automation and building reusable tools adopted by engineering teams
• Experience owning security projects end-to-end, from vendor evaluation and selection through organization-wide rollout
• Experience securing high-value or high-throughput transaction systems
• Excellent communication skills with the ability to explain technical security risks clearly and drive findings to closure
• Experience in crypto, blockchain, DeFi, or on-chain security
• Experience securing financial infrastructure or transaction-heavy platforms